The past beats inside me like a second heart.

The world needs your light, don’t dim it.

As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.

基础结构决定论原则认为，社会文化系统的结构受人口、技术和环境相互作用的影响最为强烈。

技术只是工具，人才是真正的资产。